No, I've not seen that one. I have seen it in the DVD collection here so maybe one day soon, I'll have a watch.
That scene from Casablanca when the girl sings the Anthem, you can feel the passion oozing from her. Whether she was an outstanding actress or whether the sentiments were genuinely heart-felt, I can't say. But on screen, she projects that powerful emotion across and I think it would require someone quite stone-hearted not to feel moved by it.
Ls x